3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function f() { $arr = [-1 => 'foo']; var_dump($arr[yield -1]); } $g = f(); foreach ($g as $i) { var_dump($i); }
based on ASBDk
Output for 7.0.0 - 7.2.6
int(-1) Notice: Undefined index: in /in/VS2gW on line 5 NULL
Output for hhvm-3.15.4
Fatal error: Uncaught Error: syntax error, unexpected T_YIELD, expecting ']' in /in/VS2gW:5 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
NULL string(3) "foo"